Combined fuel injection pump and nozzle for internal combustion engines



Aug. 25, 1936. .J. F. GEISER COMBINED FUEL INJECTION PUMP AND NOZZLE'FORINTERNAL COMBUSTION ENGINES v Filed March 25, 1935 G'ez'aer AT1-dannWITNIII Patented Aug.. 25, 1936 UNITED STATES PATENT OFFICE COMBINEDFUEL INJECTION PUMP AND NOZZLE FOR INTERNAL COMBUSTION ENGINES Joseph F.Geiser, Providence, R. I.

Application March 25, 1935, Serial No. 12,911

l Claim.

v fuel and introduces the atomized fuel to the engine under desiredpressure against the motivating pressure of the engine.

-With these and othervobjects in view, this invention consists incertain novel features of construction, combination and arrangement ofparts to be hereinafter more fully described and claimed.

yFor a complete understanding of my invention, reference is to be had tothe following description and accompanying drawing, in which Figure l isa vertical sectional view illustrating an injector adapted to afragmentary portion of an engine'and constructed in accordance with myinvention.

Figure 2 is a fragmentary horizontal sectional view showing means formechanically opening and closing the injector to the combustion chamberof the engine.

Figure 3 is an exploded fragmentary perspective view of a feed nut andvalve carried thereby and a fuel tube.

Figure 4 is a fragmentary vertical sectional view showing the injectorclosed to the combustion chamber andfree of the compression of theengine.

Referring in detail to the drawing, the numeral I indicates afragmentary portion of an egme wherein the cylinder is indicated by thecharacter 42, the intake and exhaust valves by the characters 3 and 4,the cylinder being closed by a head 5 and reciprocating in the cylinderis a piston 6. In the cylinder, between the piston and the head 5 is thefiring chamber of the engine and the head is constructed to receive aninjector 1 forming the subject matter"- of' the present invention.

The injector includes a housing d mounted in a passageway formed in thehead E with its inner end terminating in the firing chamber of theengine and closed except for a port 9 placing the interior of thehousing in communication with the combustion chamber. A head l0 isremovably secured to the head 5 and overlies the outer end of thehousing 8: integral with the head iii is astem il which projects intothe housing and spaced therefrom. The stem is .equipped with a bore i2communicative with a chamber I3 in the head l0. A fuel supply pipe ilconnects to the head I0 and is in communication with the chamber i3. Acheck valve I4 is located in the chamber for closing the fuel pipe iiagainst back pressure but which will permit fuel to iiow into the borei2 of the stem. A check valve I5 similar to the check valve i4 islocated lo* at the inner end of the bore l2. An elongated cylindricalpiston I6 is journaled in the housing 8 and has a frictional fit withthe stem Ii and is capable of rotating and sliding relative to the stem.A coil spring i1 .in the head ill acts 15 against the piston i6 to urgethe latter in the direction of the inner end of the housing. A gear i8is splined to the outer end of the piston and meshes with a rack bar i9.'Ihe rack bar is connected to a suitable timing mechanism (not 20 shown)of the engine for the purpose of imparting, at timed intervals,oscillatory movement to the piston.

The inner end of the piston carries a nozzle or a jet 2li arranged inalignment with the port 25 9 and this jet is opened and closed by aneedle type valve 2i slidably mounted in .a sleeve 22 forming anintegral part of a feed nut 23. The feed nut is splined to the inner endof the stem il' and the threads thereof mesh with threads 30 formed onthe piston. The sleeve, feed nut and inner end of the stem il' form afuel chamber 24, the latter being closed to the jet 2li `by the springpressed needle valve 2|.

The piston i6 is moved endwise in one direc- 35 tion by the compressiondeveloped by the piston t of the engine and is moved endwise in anopposite direction by the action of the spring il. The reciprocation of.the piston i develops a partial vacuum which acts to draw fuel into thefuel chamber 2li passing the check valves and lsaid fuel is compressedby the reciprocation of said piston it and delivers said compressed fuelto the combustion chamber of the engine. The

timing mechanism imparts rotation to the pistonl 45 y i6 in onedirection when the piston completes its the firing of the fuel in thecombustion chamber of the engine, the timing mechanism (not shown)imparts a reverse rotation to the piston, bringing about closing of thenozzle or jet by the needle 2|. The piston IB returns to its initialposition against the inner end of the housing when the piston 6 of the'engine is on its exhaust stroke causing a vacuum in the fuel chamberand suck.

andhaving a frictional fit with the stem and provided with feed threads.a feed nut slidably connected to the stem and meshing with the feedthreads of the piston, a sleeve having passages carried by the feed nutand cooperating with the latter and the stem in dening a fuel chamber, anozzle carried by the piston, a self-seating valve carried by the sleevefor opening and closing the nozzle. a spring engaging the piston carriedby the head for eifecting movement of the piston in one direction, agear on the piston, and a rack bar engaging the gear and movable attimed intervals for effecting oscillation of the piston to engage anddisengage the valve with the nozzle.

JOSEPH F. GEISER.

